XML 79 R41.htm IDEA: XBRL DOCUMENT

Goodwill And Intangible Assets (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible amortization expenses	$ 353	$ 156	$ 751	$ 460

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References+ Details